The 100-Feet gate opening sensor comes with a wand sensor and a 100-Feet wire that connects directly to the control box * The Gate Opening Sensor is buried beside the driveway on the inside of the property, and picks up a magnetic field within a 12-Foot radius of the wand sensor * When mass metal in motion (motorcycle, 4-wheeler, car or truck) passes within range of the wand sensor, a message is sent to the control box to open the gate * The gate opening sensor eliminates the need to be within remote control range in order to trigger the gate to open